Connecting Raypilot 65 into Seatalk circuit

I have recently purchase a new old stock Raypilot 65 handheld autopilot controller. At first I tried to connect it to the central wiring block for the autopilot but it wouldn't work. Then I connected it to the end of the Seatalk daisy chain that interconnects my tridata, compass, multi, autopilot, and radar/chart plotter. I did this by using the last Seatalk wire that goes into the radar. THe Raypilot 65 works fine when connected to the Seatalk. However, it required me to disconnect the radar to connect the Raypilot 65 into that last Seatalk daisy chain. Unfortunately the radar unit does not have a second Seatalk port to continue the daisy chain.

What do I need to do to get the Raypilot 65 connected into this daisy chain, or is there another connection possibility? Is there a piece of hardware I need to make this happen?
Thanks
Lew
612-889-2175